#include <stdio.h>
#include <math.h>
#define NUM 320
int number[NUM];
main()
{
    // lekai
    int i, j, count = 0;
    printf("There are following sequences in first row:\n");
    for (j = 0, i = 3; i <= 1993; i += 2)
        if (fflag(i))
            number[j++] = i;
    for (j--; number[j] > 1898; j--)
    {
        for (i = 0; number[j] - number[i] > 1898; i++)
            ;
        if (number[j] - number[i] == 1898)
            printf("(%d).%3d,......,%d\n", ++count, number[i], number[j]);
    }
}
fflag(i) int i;
{
    int j;
    if (i <= 1)
        return (0);
    if (i == 2)
        return (1);
    if (!(i % 2))
        return (0);
    for (j = 3; j <= (int)(sqrt((double)i) + 1); j += 2)
        if (!(i % j))
            return (0);
    return (1);
}